Filter-press plate



(No Model.)

H. P. CHAMBERLAIN.

' FILTER PRESS PLATE.

Patented Jan. 26,.

% Q 1 ventor :M

' Witnesses:

UNITED STATES PATENT ()FFICE.

HORACE P. CHAMBERLAIN, or BUFFALO, NEW YORK.

FILTER-PRESS PLATE.

SPECIFICATION forming part of Letters Patent N 0. 575,87 5, datedJanuary 26, 1897.

Application filed November 5, 1895. Serial No. 567,980. (No modell) Toall whom it may concern: 7 Be it known that I, HORACE P. CHAMBER- LAIN,a citizen of the United States, residing at Buffalo, in the county ofErie and State of New York, have invented certain new and usefulImprovements in Filter-Press Plates; and I do hereby declare that thefollowing de scription of my said invention, taken in connection withthe accompanying sheet of drawings, forms a full, clear, and exactspecification, which will enable others skilled in the art to whichit-belongs to make and use the same.

cation, Figure l is a plan of a filter-press plate embodying myimprovements. Fig. 2 is an edge view of the same. Fig. 3 is a plan of afragment of said filter-press plate, showin g one side of one of theseparating-disks employed thereon. Fig. 4 is a transverse section inline a; a; of Fig. 8. Fig. 5 is a plan of a filter-press plate, showingthat side of the separating-disk opposite the one illustrated in Fig. 4.

Like parts are designated by corresponding letters of reference in allthe figures.

The object of this invention is the production of a durable,serviceable, convenient, and cheap method of applying the canvascoverings and separating-disks to filter-press plates. To attain theseresults, I construct my improved filter-press plates of a series ofdisks, the central one of which, A, is a circular sheet of metal havingin its center an aperture a, for the passage of the liquid to befiltered, and on its edge and on opposite points lugs A A", by means ofwhich the filter-press 7 plate is suspended from the press-rods B B.

On both sides of this central plate there are circular perforated platesor disks 0 O, which are covered on their outer sides with canvas D D, asclearlyindicated in Figs. 1, 3, 4:, and 5. These plates and their canvascovering are secured together by means of a series of separating-disks EE, being conical bodies having centrally an aperture for the passage ofa bolt F, one of these separating-disks, E, having a countersink e toreceive the head f of said bolt F, while the other (opposite) one has asquare oroblong recess 9 for the retention of the nut F of said bolt F.Underneath the separating-disks E E there are placed canvas Washers G,to protect the canvas covering D D of the perforated plates from injuryby coming in contact with the metallic separating-disks and to make atight joint around the same, while in the square or angular recess e ofsaid separating-disks and underneath the nut F is placed a soft-m etalwasher or packing G for a similar urpose.

I-Ieretofore separating-dis s have been applied to filter-press platesby means of rivets. During use the canvas covering of the perforatedplates is liable to injury, and when repair is necessary these rivetshave to be withdrawn by chipping or drilling them out, which frequentlyresults in denting the delicately-perforated plates, bending, andotherwise injuring them, while the canvas also is more or less hurt.Furthermore, it is necessary that these separating-disks are verysecurelyaffixed to the plates, and this is difficult to accomplish byriveting, owing to the rather soft and yielding nature of the canvas. Bysubstituting the bolts F for such rivets and by screwing them verytightly up I have accomplished the result that the plates are notaffected in the least either by applying or removing theseparating-clisks, while at the same time the removal and attachment ofthe said separating-disks are accomplished in a very short space oftime, which is quite an essential feature when a costly filter-press andvaluable material to be filtered has to wait for repairs of the plates.

Having thus fully described my invention, I claim as new and desire tosecure to me by Letters Patent of the United States- As an improvedarticle of manufacture a filter-press-plate consisting, essentially, ofa central disk having centrally an aperture and provided atdiametrically opposite points with lugs, of two perforated disks locatedone on each side of said central disk, canvas covers on the outer sidesof said perforated disks, a series of separating-disks upon said canvascovers and canvas Washers under said sepa- In testimony that I claim theforegoing as rating-disks, said separating-disks being semy invention Ihave hereunto set my hand I0 cured to the plates and covers by boltshaving in the presence of two subscribing Witnesses.

countersunk heads in one of the said series 1 5 of separating-disks, andangular nuts ein- ORACE P. CHAMBERLAIN.

bedded in corresponding recesses in the op- Attest: I posits series ofseparating-disks, all as here P. L. SANGER,

inbefore set forth and described. J AS. A. PINooTT.

